The invention puts forward a combined emergency bridge and an erection method thereof which are designed for solving the problems that in the prior art, the quick restoration on the traffics at the gap positions of highway subgrades and the derogative areas of subgrades is realized by way of building shortcuts, therefore, the restoration is restricted by terrain conditions and affected by secondary geological disasters, meanwhile, the restoration is long in time, time-consuming, labor-consuming and the like. The combined emergency bridge comprises cubic steel frames, triangular prism-shaped steel frames, bearing wire cables, fixing wire cables and road slabs. The combined emergency bridge and the erection method thereof have the following beneficial effects: the bearing wire cables and combined steel frames of the bridge constitute a statically indeterminate self-bearing structure system, horizontal pressures produced by the steel frames are transmitted to the ends of the bridge, and the loads of the triangular prism-shaped steel frames are balanced by the tension of the bearing wire cables; the steel frames of the combined emergency bridge provided by the invention can not be fabricated on site, and the fabrication of the steel frames can be standardized and serialized; and the erection method of the combined emergency bridge is simple without carrying out excessive treatments on disaster sites, therefore, the method has the characteristics of emergency, speediness and convenience.